Registration is now open for the Knoxville Recreation Center’s summer Body Fit Challenge. The intense four day a week workout schedule lasts 6 weeks and is designed to trim and tone and increase lean body mass. The challenge will take place Mondays-Thursdays July 11 through August 22nd with the first three weeks of classes beginning at 5:45am. In order to provide personalized instruction time, the program is open to just 12 registrants on a first come, first serve basis. Registrations are due July 8th and forms can be completed at the recreation center, located at 800 South Park Lane in Knoxville.